CVE-2026-6673
EUVD-2026-3824922.06.2026, 14:17
Mattermost versions 11.7.x <= 11.7.0, 11.6.x <= 11.6.2, 11.5.x <= 11.5.5, 10.11.x <= 10.11.17 fail to authenticate Atlassian Connect installed callbacks, allowing a remote unauthenticated attacker to inject a rogue sharedSecret and disrupt the Jira integration via POST to /ac/installed during the pending-install window.. Mattermost Advisory ID: MMSA-2026-00654Enginsight
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| mattermost | mattermost_server | 10.11.0 ≤ 𝑥 < 10.11.18 |
| mattermost | mattermost_server | 11.5.0 ≤ 𝑥 < 11.5.6 |
| mattermost | mattermost_server | 11.6.0 ≤ 𝑥 < 11.6.3 |
| mattermost | mattermost_server | 11.7.0 ≤ 𝑥 < 11.7.1 |
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
| Vendor | Product | Version | Source |
|---|---|---|---|
| mattermost | mattermost | 𝑥 ≤ 11.7.0 | CNA |
| mattermost | mattermost | 11.6.0 ≤ 𝑥 ≤ 11.6.2 | CNA |
| mattermost | mattermost | 11.5.0 ≤ 𝑥 ≤ 11.5.5 | CNA |
| mattermost | mattermost | 10.11.0 ≤ 𝑥 ≤ 10.11.17 | CNA |
Common Weakness Enumeration
References